J is a bias correction factor that used to remove the small-sample-size bias of the standardized differences of means.
Ivan Namakoola
Yes, the metafor package in R can calculate Hedges’ d with or without J. The escalc function in the metafor package allows you to calculate various effect sizes, including Hedges’ d. By default, the function calculates Hedges’ d with small sample size correction (J), but you can also specify the argument small=FALSE to calculate Hedges’ d without the correction.
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